My pool was completed in October and I have noticed these spots on the bottom for a couple of months. Is this black algae? It's hard to tell with the pebble finish and the water temperature is 62 so I have not gotten in to inspect closer. I have brushed multiple times with no luck.
Before starting to treat for Black Algae, I thought I would get other opinions on whether or this is black algae. These are the best pictures I could get (look for the black spots :
Before starting to treat for Black Algae, I thought I would get other opinions on whether or this is black algae. These are the best pictures I could get (look for the black spots :